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From Wikipedia:

Coaxial cable

Coaxial cable, or coax is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. Many coaxial cables also have an insulating outer sheath or jacket. The term coaxial comes from the inner conductor and the outer shield sharing a geometric axis. Coaxial cable was used in the first and following transatlantic cable installations, but its theory wasn't described until 1880 by English... Read More

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